Product Specifications • Knowledge Centre

What is Included in a Prefabricated Steel Building Kit? (Complete BOM Checklist)

An exhaustive component-by-component breakdown of everything included in a SerBuild prefabricated steel building kit, from primary portal frames to fasteners, flashings, and 3D erection guides.

Author: İdris YAĞMAHAN (Architect) Reviewed by: Celalettin YAĞMAHAN (Senior Structural Engineer) Reading time: 10 min read Updated: 2026-02-28
Eurocode 3 & 8 Certified Engineering
EN 1090-2 Factory Quality Control
40ft HC Container Packing & Flat-Pack Export
100% Bolted Field Assembly (Zero Site Welding)

⚡ Quick Answer / Executive Summary

A complete SerBuild prefabricated steel building kit is a 100% pre-engineered, flat-pack industrial superstructure delivered to your jobsite with zero on-site cutting or welding required. The standard kit comprises five integrated subsystems: 1) Primary Load-Bearing Frame (S355JR hot-rolled/welded columns, portal rafters, and crane runway girders), 2) Secondary Framing (S350GD galvanized Z and C purlins, girts, and eave struts), 3) High-Tensile Structural Fasteners (Grade 8.8 / 10.9 hot-dip galvanized bolts, chemical foundation anchors, and EPDM self-drilling screws), 4) Weatherproof Thermal Envelope (PIR or mineral wool sandwich panels, polycarbonate roof lights, and perimeter flashings), and 5) Comprehensive Engineering Dossier (Eurocode static report, foundation anchor templates, and 3D step-by-step Tekla erection manual).

Key Engineering & Cost Takeaways

  • ✔ 100% Pre-Drilled & Pre-Welded: Zero site cutting or field welding required—all joints are precision bolted
  • ✔ Complete Structural Fasteners: Includes 100% of Grade 8.8/10.9 bolts, nuts, washers, and anchor rods + 5% surplus buffer
  • ✔ Galvanized Secondary Purlins: S350GD+Z275 galvanized continuous Z-purlins provide 50+ year corrosion resistance
  • ✔ Architectural Flashing Suite: Includes ridge caps, corner trims, drip edges, base channels, and alu-zinc gutters
  • ✔ Foundation Anchor Templates: Heavy-gauge steel positioning templates ensure anchor bolt alignment to ±1.5mm
  • ✔ 3D Interactive Manual: Color-coded assembly manual matches alphanumeric piece marks hard-stamped on every steel member

1. Component-by-Component Bill of Materials (BOM)

When a SerBuild container arrives at your construction site, it contains an exhaustive, turn-key hardware package engineered for rapid mechanical assembly:

  • Primary Structural Steel Framing: Hot-rolled and custom-welded S355JR portal columns, roof rafters, apex crown joints, column baseplates with pre-drilled anchor slots, and crane runway corbels.
  • Galvanized Secondary Steelwork: High-tensile S350GD+Z275 cold-formed Z-purlins (roof) and C-girts (walls) with pre-punched 14mm bolt holes, sag rods, tie-angles, and tubular knee braces.
  • Lateral & Roof Bracing System: High-strength steel cross-bracing cables (or tension rod systems) with calibrated turnbuckles to resist longitudinal wind and seismic shear.
  • Fastener & Hardware Crates: Grade 8.8 and Grade 10.9 structural bolts (EN 14399 / EN 15048), heavy hex nuts, hardened washers, EPDM sealing screws, expansion anchor bolts, and structural adhesive.
  • Thermal Envelope & Rainwater Goods: 80mm–120mm PIR sandwich panels (or single-skin sheets), factory-cut corner trims, gable flashings, eaves gutters, downspouts, and butyl joint sealants.

2. Kit Value Distribution Matrix (Share of Superstructure Budget)

The breakdown below shows the value contribution of each subsystem within a standard prefabricated steel building kit:

📊 Itemized Cost & Specification Table (€ / m²)

Kit Subsystem Included Components & Materials Share of Kit Value Typical Value (1,200 m² Kit)
Primary Steel Skeleton Columns, rafters, haunches, crane girders, apex plates (S355JR) 45% – 50% €58,000 – €72,000
Secondary Galvanized Framing S350GD Z-purlins, C-girts, eave struts, sag rods, wind bracings 15% – 18% €20,000 – €26,000
Insulated Cladding Envelope PIR roof & wall sandwich panels (80mm), translucent skylights 25% – 30% €34,000 – €44,000
Fasteners, Trims & Flashings Grade 8.8/10.9 bolts, anchors, ridge caps, gutters, downspouts, butyl 6% – 8% €8,000 – €12,000
Engineering & 3D Documentation Static report, Tekla 3D model, anchor templates, 3D erection book Included (0%) Included (€0)

🔍 Comparative Engineering & Scale Matrix

Kit Tier / Option Primary Frame Secondary Purlins Insulated Panels Fasteners & Trims Best Application
Core Frame Only Kit Included (S355JR) Included (S350GD) Excluded (Client sources) Bolts only Local cladding sourcing or masonry infill
Closed Shell Weather-Tight Kit Included (S355JR) Included (S350GD) Included (80mm PIR) Included (Full trim) Standard industrial & logistics warehouses (Most Popular)
Heavy Industrial Crane Kit Included (+Crane beams) Included (Heavy Z) Included (100mm PIR) Included (Full trim) Manufacturing, fabrication & assembly facilities
Cold Storage Envelope Kit Included (S355JR) Included (S350GD) Included (150mm PIR) Included (Thermal break) Food logistics & temperature-controlled warehouses

📋 Step-by-Step Project Execution Workflow

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1. Unpacking & Bill of Materials Check

Inspect container packing lists and verify crate contents against digital QR codes.

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2. Setting Anchor Templates

Position steel anchor templates on formwork and cast chemical/J-bolt anchor rods.

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3. Column Erection

Crane lifts columns onto anchor bolts; tighten base nuts and install temporary guy-wire bracings.

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4. Rafter Assembly & Lifting

Pre-bolt rafter halves on the ground; crane lifts complete portal arch into position.

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5. Purlin & Bracing Installation

Bolt continuous Z-purlins across roof and tighten cross-tension bracing rods.

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6. Cladding & Flashing Fixing

Fasten sandwich panels with self-drilling EPDM screws and install color-matched flashings.

Need Project-Specific Static Sizing & Pricing?

Submit your building dimensions, clear spans, and site location coordinates. Our structural engineering department provides itemized cost estimates and Eurocode 3 static reports within 24–48 hours.

Request Project Quote → WhatsApp Technical Desk

Frequently Asked Questions

Detailed answers to technical, manufacturing, export, and on-site assembly questions.

Yes. SerBuild includes high-tensile Grade 8.8 anchor bolt rods, heavy leveling nuts, oversized baseplate washers, and steel positioning templates with every building kit.

No. All SerBuild steel building kits are 100% pre-cut, pre-punched, and pre-welded in our CNC factory. Assembly on site is 100% mechanical bolting using standard hand and power tools.

Every SerBuild kit is packed with a standard 5% surplus of all fasteners, bolts, nuts, washers, screws, and butyl sealing tapes to ensure zero downtime on site.

Industrial sectional doors, automated roller shutters, and fire-rated steel personnel doors can be bundled directly into the kit package with pre-framed structural openings (trimmers and headers) included in the primary steel design.

We provide a comprehensive 3D step-by-step assembly manual generated directly from the Tekla BIM model, featuring color-coded exploded 3D connection details, bolt torque specification tables, and a complete part numbering index.

Request an Engineered Steel Building Proposal

Submit your project dimensions, drawings or requirements for an engineering review and itemized quote within 24–48 hours.

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Step 1: What type of steel building are you planning?

Step 2: Project Location & Target Dimensions

Step 3: Preferred Delivery Scope & Engineering Equipment

Step 4: Project Schedule, Incoterms & Readiness

Step 5: Contact Details & CAD / Drawing Upload

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